Thermodynamic properties, low-GWP, refrigerant, HFO, centrifugal chiller
In refrigeration and air-conditioning industry, HFCs refrigerantssuch as HFC-134a, HFC-245fa, R-410A and R-404A were developed as CFCs or HCFCs alternative refrigerants which have Ozone depletion Potential (ODP). But HFCs have high global warming potential (GWP), there are urgent needs to reduce HFCs emissions. AMOLEA is a next-generation solvent and refrigerant brand developed by AGC under the concept of dramatically reducing GWP with superior performance. AMOLEA yd that consists of HCFO-1224yd has the good characters such as low-GWP, non-flammable, low-toxicity, good-chemical and thermal suitability, good-compatibility with oil and equipment components. HCFO-1224yd has similar thermal properties to HFC-245fa, so it is suitable to use as the refrigerant to alternate HFC-245fa and HCFC-123 for centrifugal chiller, organic Rankine cycle system, heat pumps. This paper shows the properties of HCFO-1224yd, including critical parameters, vapor-liquid coexistence curve, vapor pressure and PVT properties, were determined experimentally. The measurements of vapor-liquid coexistence curve in the critical region were made through visual observation of the disappearance of meniscus at the vapor-liquid interface within an optical cell. The vapor pressure and the PVT properties were made using the constant-volume method. The saturated liquid densities were obtained by the method using pyrex glass floats. The new experimental data and correlations were presented. On the basis of measurements of the density-temperature relation along the vapor-liquid coexistence curve near the critical point, the critical density was determined by the observation of disappearance of the vapor-liquid interface and of the intensity of critical opalescence. The critical density was determined as 530kg/m3. The critical temperature can be determined as the saturation temperature corresponding to the critical density. The critical temperature was determined as 429.1K. The critical pressure was determined by extrapolation of the vapor pressure measurements to the critical temperature as 3.379MPa. The correlation equation of vapor pressure and saturated density were developed. The root mean square deviation was 0.6% in the correlation equation of vapor pressure. In case of saturated density, the root mean square deviation was 0.9%.